Boat.



No. 798,944. PATENTED JULY 4, 1905.

0.. A. MANKER.

BOAT.

APPLICATION FILED DBO. a1, 1903.

CAREY A. MANKEZR ATTY'S.

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aflvl lfn Merrit Patented July t, 190% CAREY A. lVlANKER, OF PEARL, llil'JlN'Olt-l SPECIFICATION forming part of Letters Patent No. 793,94tlt, dated July 4%, 1905.

Application filed December 81, 1903. Serial No. 187,292.

To (all whom 7 7121/1/11 concern/.-

Be it known that l, Ca 1:. av A. Ma an an, a eiti- Zen of the United States, residing in Pearl, in the county of Pike and State of .lllinois, have invented certain new and usefulImprovements in Boats, of which the following is a full,clear, and exact description, reference being bad to the accompanyil'ig drawings, forming part of this specification.

My invention relates to a boat for marine navigation, the object of the invention being to construct a vessel of such shape that the water through which it passes will offer the least resistance thereto, and, furthernnn'e, a. construction that will provide for the vessel maintaining its eouililn-ium by preventing to the greatest possible extent tossing action thereof due to the effect of waves striking the vessel.

The invention consists in features of now elty hereinafter fully described, and pointed out in the claims.

Figure l is a side view of my iuuin'oved boat. Fig. .11 is a bottom view. Fig. lll is a longitudinal section of the boat. Fig. 1V is an enlarged end view. Fig. V is an enlarged vertical section taken on line V V. Fig.1. lliig. V1 is an enlarged vertical section taken on line Vl VI, Fig. l.

1 designates the body of my boat, which is of cigar shape. so that said body has a rounded tapering bow f2 and a rounded tapering stern 3. By forming a boat of this shape I produce a structure that will float upon and in the waterin which it moves with very slight resistance offered to its movement, as will be readily understood. The bottom of the body of the vessel is concaved longitudinally from a forward point .1; to a rear point 5 (see Figs. ll and illll) and concavcd transverselybetween points 6 and 7, as seen in Figs. ll, 1V, V, and

The transverse concavity is narrowest near the ends of the longitudinal concavity and gradually widens to the center of the boatbody, thereby furnishing the greatest surface for waterimpact at the longitudinal center of the boat. by concaving the boat-body at its under side as described ll furnish a pocket beneath the boat between a pair of longitudinally-extending limbs, in which water is constantly present to press against the curving :faces in such locality incident to the concavities, and by reason of the water bearing against said curved faces it exerts a constant force longitudinally and transversely of the bottom of the boat, as a result of which tipping and tossing of the boat is lessened to a very material degree. The for\vard end of the corn cavity at the lower side of the boat terminates at +1: at a greater elevation than the rear end of the concavity. the intermediate surface gradually curvingdownwardly from front to rear, and therefore the water beneath the vessel may enter into the concavity without producing a suction therein as the boat moves forwardly on the water. As a result of producing the concavity with the forward end. most elevated the water readily enters said forward end and moves rearwardly in a longitudinal direction in the concavity and then downwardly toward the rear of the boat, during which time it exerts the desired sustaining influence. This is due to the area within the concavity forming a hydro curve, which secures an inniingement of the water throughout the whole area of the concavity as the boat moves forwardly.

t designates a hollow keel extending longitudinally of the boat at its under side, and 9 represents propellers,the blades of which operate through the sides of said lceel, so that the ascending blades are n'actically shielded thereby during their action.

l claim as my invention l. A boat having a concavity at the lower side of its hull terminating at its forward end above the lowermost surface of the hull to provide free emlrance for water into the front end of the cavity; said concavity merging into the lowermost surface of the hull at its rear end rearward from the longitudinal center of the boat.

2. A boat having at the lower Side of its terminating at its rear end at the lowermost hull a pair of longitudinal limbs extending surface of the hull and rearward from thelonfrom the forward end of the hull to a point g'itudinal center of the boat.

beyond the longitudinal center of the hull; CAREY A. MANKER. 5 said limbs providing a concavity terminating In presence of at the forward end between said limbs and E. S. KNIGHT,

above the lowermost surface of the hull and M. P. SMITH. 

